CQL matching by datetime

Hi!

What is the proper way to match objects by a datetime value using CQL?
I cannot figure out how to do this. It works fine when I match a
string value (sample_host). Doing the same on a datetime column
(sample_time) does not lead to a match:

$ cimcli xq 'select sample_host,sample_time
    from TEST_server_performance
    where sample_host="db1.quidecco.de"'
path= //dev.quidecco.de/root/cimv2:TEST_server_performance.OID=139920171280

//Instance of TEST_server_performance
instance of TEST_server_performance
{
sample_time = "20120211110507.000000+000";
sample_host = "db1.quidecco.de";
};

$ cimcli xq 'select sample_host,sample_time
    from TEST_server_performance
    where sample_time="20120211110507.000000+000"'

$

I'm using OpenPegasus 2.10.1. Is this even possible to do? Do I
need to use another syntax for the datetime values?

Thanks in advance!

Best regards,

Isidor Zeuner